Ran CCleaner and Messed Up my background

After using a third-party cache cleaning tool such as CCleaner, the Bing Dynamic Theme icon may be displayed in black color in the Personalize window, and desktop backgrounds don’t appear.

This happens if the “Enclosure” folder, present under the Temporary Internet Files folder is cleared. The “Enclosure” folder is where the Bing Dynamic wallpapers are stored, under a sub-directory with random GUID name. This was reported in CCleaner forums and an appropriate workaround has been posted. Until this issue gets fixed in newer builds, you may add the following folder path to the Exclude items listing in CCleaner settings: